package com.spzx.cart.service.impl;

import com.spzx.cart.domain.CartInfo;
import com.spzx.cart.service.ICartService;
import com.spzx.common.core.constant.SecurityConstants;
import com.spzx.common.core.context.SecurityContextHolder;
import com.spzx.common.core.domain.R;
import com.spzx.common.core.exception.ServiceException;
import com.spzx.common.core.web.domain.AjaxResult;
import com.spzx.product.api.RemoteProductService;
import com.spzx.product.domain.ProductSku;
import com.spzx.product.domain.SkuPrice;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundHashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class CartServiceImpl implements ICartService {

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private RemoteProductService remoteProductService;

    private String getCartKey(Long userId) {
        //定义key user:userId:cart
        return "user:cart:" + userId;
    }

    @Override
    public void addToCart(Long skuId, Integer skuNum) {
        // 获取当前登录用户的id
        Long userId = SecurityContextHolder.getUserId();

        //1.构建“用户”购物车hash结构key  user：用户ID：cart
        String cartKey = getCartKey(userId);

        //2.创建Hash结构绑定操作对象（方便对hash进行操作）
        BoundHashOperations<String, String, CartInfo> hashOps = redisTemplate.boundHashOps(cartKey);

        //4.判断用户购物车中是否包含该商品 如果包含：数量进行累加(某件商品数量上限99) 不包含：新增购物车商品
        String hashKey = skuId.toString();
        Integer threshold = 99;
        if (hashOps.hasKey(hashKey)) {
            //4.1 说明该商品在购物车中已有，对数量进行累加 ，不能超过指定上限99
            CartInfo cartInfo = hashOps.get(hashKey);
            int totalCount = cartInfo.getSkuNum() + skuNum;
            cartInfo.setSkuNum(totalCount > threshold ? threshold : totalCount);
            hashOps.put(hashKey, cartInfo);
        } else {
            //3.判断购物车商品种类（不同SKU）总数大于50件
            Long count = hashOps.size();
            if (++count > 50) {
                throw new RuntimeException("商品种类数量超过上限！");
            }
            //4. 说明购物车没有该商品，构建购物车对象，存入Redis
            CartInfo cartInfo = new CartInfo();
            cartInfo.setUserId(userId);
            cartInfo.setSkuNum(skuNum > threshold ? threshold : skuNum);
            cartInfo.setUpdateTime(new Date());
            cartInfo.setCreateTime(new Date());
            //4.1 远程调用商品服务获取商品sku基本信息
            R<ProductSku> productSkuResult = remoteProductService.getProductSku(skuId, SecurityConstants.INNER);
            if (R.FAIL == productSkuResult.getCode()) {
                throw new ServiceException(productSkuResult.getMsg());
            }
            ProductSku productSku = productSkuResult.getData();
            cartInfo.setSkuId(skuId);
            cartInfo.setSkuName(productSku.getSkuName());
            cartInfo.setThumbImg(productSku.getThumbImg());

            //4.2 远程调用商品服务获取商品实时价格
            R<SkuPrice> skuPriceResult = remoteProductService.getSkuPrice(skuId, SecurityConstants.INNER);
            if (R.FAIL == skuPriceResult.getCode()) {
                throw new ServiceException(skuPriceResult.getMsg());
            }
            SkuPrice skuPrice = skuPriceResult.getData();
            cartInfo.setCartPrice(skuPrice.getSalePrice());
            cartInfo.setSkuPrice(skuPrice.getSalePrice());

            //4.3 将购物车商品存入Redis
            hashOps.put(hashKey, cartInfo);
        }
    }

    @Override
    public List<CartInfo> cartList() {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String,String,CartInfo> cartInfoBoundHashOperations = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> values = cartInfoBoundHashOperations.values();
        return values;
    }

    @Override
    public void deleteCart(Long skuId) {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String,String,CartInfo> cartInfoBoundHashOperations = redisTemplate.boundHashOps(cartKey);
        cartInfoBoundHashOperations.delete(skuId.toString());
    }

    @Override
    public void checkCart(Long skuId, Integer isChecked) {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String,String,CartInfo> cartInfoBoundHashOperations = redisTemplate.boundHashOps(cartKey);
        // 取出redis数据更新状态
        CartInfo cartInfo = cartInfoBoundHashOperations.get(skuId+"");
        cartInfo.setIsChecked(isChecked);
        // 放回redis
        cartInfoBoundHashOperations.put(skuId+"",cartInfo);
    }

    @Override
    public void allCheckCart(Integer isChecked) {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String,String,CartInfo> cartInfoBoundHashOperations = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> cartInfos = cartInfoBoundHashOperations.values();
        cartInfos.forEach(cartInfo ->{
            CartInfo cartInfoKey = cartInfoBoundHashOperations.get(cartInfo.getSkuId().toString());
            cartInfoKey.setIsChecked(isChecked);
            cartInfoBoundHashOperations.put(cartInfo.getSkuId().toString(),cartInfoKey);
        });

    }

    @Override
    public void clearCart() {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        redisTemplate.delete(cartKey);
    }

    @Override
    public List<CartInfo> getCartCheckedList(Long userId) {
        List<CartInfo> cartInfos = new ArrayList<CartInfo>();
        Long userId1 = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId1);
        BoundHashOperations<String,String,CartInfo> cartInfoBoundHashOperations = redisTemplate.boundHashOps(cartKey);
        List<CartInfo> values = cartInfoBoundHashOperations.values();
        List<CartInfo> cartInfoList = values.stream().filter(cartInfo -> cartInfo.getIsChecked() == 1).collect(Collectors.toList());
        return cartInfoList;
    }

    @Override
    public void removeCheckedCart(List<Long> skuIds) {
        Long userId = SecurityContextHolder.getUserId();
        String cartKey = getCartKey(userId);
        BoundHashOperations<String,String,CartInfo> cartInfoBoundHashOperations = redisTemplate.boundHashOps(cartKey);
        skuIds.forEach(skuId -> cartInfoBoundHashOperations.delete((skuId+"")));
// 出错，不可用    cartInfoBoundHashOperations.delete(skuIds.toArray());
    }
}